Pgcli

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* Update to ``prompt-toolkit`` 2.0. (Thanks: `Jonathan Slenders`_, `Dick Marinus`_, `Irina Truong`_)

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Features:
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* Respect `\pset pager on` and use pager when output is longer than terminal height (Thanks: `Max Rothman`_)

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Bug fixes:
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* Adapt the query used to get functions metadata to PG11 (919). (Thanks: `Lele Gaifax`_).
* Fix for error retrieving version in Redshift (922). (Thanks: `Irina Truong`_)
* Fix for keyring not disabled properly (920). (Thanks: `Irina Truong`_)

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Features:
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* Make `keyring` optional (Thanks: `Dick Marinus`_)

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Bug fixes:
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* Fix for missing keyring. (Thanks: `Kenny Do`_)
* Fix for "-l" Flag Throws Error (909). (Thanks: `Irina Truong`_)

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Features:
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* Add quit commands to the completion menu. (Thanks: `Jason Ribeiro`_)
* Add table formats to ``\T`` completion. (Thanks: `Jason Ribeiro`_)
* Support `\\ev``, ``\ef`` (754). (Thanks: `Catherine Devlin`_)
* Add ``application_name`` to help identify pgcli connection to database (issue 868) (Thanks: `François Pietka`_)
* Add `--user` option, duplicate of `--username`, the same cli option like `psql` (Thanks: `Alexandr Korsak`_)

Internal changes:
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* Mark tests requiring a running database server as dbtest (Thanks: `Dick Marinus`_)
* Add an is_special command flag to MetaQuery (Thanks: `Rishi Ramraj`_)
* Ported Destructive Warning from mycli.
* Refactor Destructive Warning behave tests (Thanks: `Dick Marinus`_)

Bug Fixes:
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* Disable pager when using \watch (837). (Thanks: `Jason Ribeiro`_)
* Don't offer to reconnect when we can't change a param in realtime (807). (Thanks: `Amjith Ramanujam`_ and `Saif Hakim`_)
* Make keyring optional. (Thanks: `Dick Marinus`_)
* Fix ipython magic connection (891). (Thanks: `Irina Truong`_)
* Fix not enough values to unpack. (Thanks: `Matthieu Guilbert`_)
* Fix unbound local error when destructive_warning is false. (Thanks: `Matthieu Guilbert`_)
* Render tab characters as 4 spaces instead of `^I`. (Thanks: `Artur Balabanov`_)